LT3503 查看數據表（PDF） - Linear Technology

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LT3503

1A, 2.2MHz Step-Down Switching Regulator in 2mm × 3mm DFN

Linear Technology 

FEATURES

■ Wide Input Range: 3.6V to 20V

■ 5V at 1.2A from 11V to 18V Input

■ 5V at 1A from 7.2V to 18V Input

■ 3.3V at 1.2A from 8.5V to 12V Input

■ 3.3V at 1A from 5.5V to 12V Input

■ Fixed Frequency Operation: 2.2MHz

■ Output Adjustable Down to 780mV

■ Short-Circuit Robust

■ Uses Tiny Capacitors and Inductors

■ Soft-Start

■ Internally Compensated

■ Low Shutdown Current: <2µA

■ Low VCESAT Switch: 400mV at 1A

■ Thermally Enhanced, 2mm × 3mm 6-Pin DFN

Low Profile Package

U

APPLICATIO S

■ Automotive Battery Regulation

■ Industrial Control Supplies

■ Wall Transformer Regulation

■ Distributed Supply Regulation

■ Battery-Powered Equipment

LT3503

1A, 2.2MHz Step-Down

Switching Regulator in

2mm × 3mm DFN

DESCRIPTIO

The LT®3503 is a current mode PWM step-down DC/DC

converter with an internal 1.45A power switch. The wide

operating input range of 3.6V to 20V makes the LT3503

ideal for regulating power from a wide variety of sources.

Its high operating frequency allows the use of tiny, low

cost inductors and ceramic capacitors, resulting in low,

predictable output ripple.

Cycle-by-cycle current limit provides protection against

shorted outputs and soft-start eliminates input current

surge during start-up. The low current (<2µA) shutdown

mode provides output disconnect, enabling easy power

management in battery-powered systems.

, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

TYPICAL APPLICATIO

3.3V Step-Down Converter

VIN

4.5V TO 12V

20V MAX

ON OFF

VIN

BOOST

LT3503

SHDN

SW

GND FB

1µF

0.1µF 2.5µH

37.4k

11.5k

VOUT

3.3V

1A, VIN > 5.5V

1.2A, VIN > 8.5V

120pF

10µF

3503 TA01a

Efficiency

85

VIN = 12V

80

75

70

65

60

55

50

0 0.2 0.4 0.6 0.8 1.0 1.2

LOAD CURRENT (A)

3503 TA01b

3503f

1

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